US20090155078A1 - Brazed torque converter pump hub assembly and method of fabrication - Google Patents

Brazed torque converter pump hub assembly and method of fabrication Download PDF

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Publication number
US20090155078A1
US20090155078A1 US12/316,229 US31622908A US2009155078A1 US 20090155078 A1 US20090155078 A1 US 20090155078A1 US 31622908 A US31622908 A US 31622908A US 2009155078 A1 US2009155078 A1 US 2009155078A1
Authority
US
United States
Prior art keywords
pump
impeller
assembly
hub
torque converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/316,229
Other languages
English (en)
Inventor
Gregory A. HEEKE
Bhaskar Marathe
Bruno Mueller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Buehl Verwaltungs GmbH
Original Assignee
LuK Lamellen und Kupplungsbau Beteiligungs KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LuK Lamellen und Kupplungsbau Beteiligungs KG filed Critical LuK Lamellen und Kupplungsbau Beteiligungs KG
Priority to US12/316,229 priority Critical patent/US20090155078A1/en
Assigned to LUK LAMELLEN UND KUPPLUNGSBAU BETEILIGUNGS KG reassignment LUK LAMELLEN UND KUPPLUNGSBAU BETEILIGUNGS KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MUELLER, BRUNO, MARATHE, BHASKAR, HEEKE, GREGORY A.
Publication of US20090155078A1 publication Critical patent/US20090155078A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H41/00—Rotary fluid gearing of the hydrokinetic type
    • F16H41/24—Details
    • F16H41/28—Details with respect to manufacture, e.g. blade attachment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/49332—Propeller making

Definitions

  • the present invention relates generally to more efficient, and therefore, more economic methods in the fabrication of torque converters for motorized vehicles which eliminate multiple brazing/welding steps in sub-assembly operations.
  • Torque converters are positioned between the engine and transmission case of motorized vehicles. They play an important role by controlling on/off power from the engine to the rest of the drive train. In addition, they provide torque multiplication, dampen engine vibration and assure smooth start-ups and speed changes.
  • a typical torque converter assembly comprises as principal components, an impeller or pump, a turbine and a stator positioned between the turbine and pump.
  • the turbine and pump are seated in opposing shells and rotate therewith.
  • the torque converter pump is connected to the engine, and as the pump rotates energy is transmitted to the turbine by forcing fluid against turbine blades causing their rotation.
  • the turbine which is connected to the transmission, transmits torque to vehicle wheels.
  • the torque converter pump also turns the transmission oil pump.
  • the stator positioned between the turbine and impeller operates to redirect the flow of fluid allowing the pump to rotate with less torque, so as to provide torque multiplication.
  • the method of the present invention effectively eliminates the need for a second bonding step, such as by MIG (metal inert gas) welding. That is to say, the method of the present invention removes the welding step currently required to bond the pump hub to the impeller, and therefore, also eliminates the task of refixturing the hub and impeller followed by a second welding operation.
  • MIG metal inert gas
  • Methods of the invention also provide for the step of mounting and positioning the pump blades and the pump hub adjacent to the impeller with jigging means, such as an appropriate fixture as disclosed in further detail below.
  • Brazing is generally intended to relate to processes wherein parts of the torque converter, i.e., the pump hub, blades and impeller, are joined by heating to the melting point of the filler metal (paste) being used.
  • This allows the molten filler metal to flow via capillary action into the close fitting surfaces of the joint.
  • This is normally performed in a furnace, i.e., brazing furnace.
  • the base metal does not melt, but may alloy with the molten filler metal.
  • Welding forms a metallurgical joint in much the same way as brazing, however, with welding processes filler metals flow at generally higher temperatures than the brazing filler metals, but at or just below the melting point of the base metals being joined.
  • FIG. 1 is a side sectional view of one embodiment of the invention mounted on a suitable jig for brazing wherein pump blades and pump hub having a lap seal arrangement are bonded to the impeller in a single brazing step.
  • FIG. 1 of the drawings there is shown an impeller assembly 10 mounted in a brazing fixture or jig 12 suitable for holding impeller 14 , a plurality of pump blades 16 and a flanged pump hub 18 for brazing in a single operation.
  • the fixture or jig serves two purposes: firstly to elevate the workpiece so the pump hub can protrude downwardly without contacting the furnace belt during brazing, and secondly, to center the hub in the impeller.
  • the assembly is prepared for brazing by initially placing pump blades 16 formed with tabs (not shown) on the outside edge for fitting into depressions 17 formed in the inside wall of impeller 14 .
  • pump blades 16 have tabs on the inside edge that fit into slots (not shown) in core ring 19 of the impeller. After positioning the blades in the impeller depressions 17 and slots of the core ring 19 the tabs passing through the core ring are bent locking the blades in place.
  • a paste such as a copper-based furnace brazing paste, commercially available under the Cubond® trademark from SCM Metal Products, Inc., of N. Carolina is then deposited where each blade meets the ID of the shell of the impeller and the OD of the core ring.
  • the paste is conveniently deposited as dabs at each of the tabs using a commercially available paste gun having a plurality of tips so as the impeller shell is rotated dabs of the paste are deposited at tab areas 20 where the tab depressions 17 are located and at the OD of the blades where the tabs have engaged with slots in core ring 19 .
  • the pump hub 18 having flange 22 Prior to brazing the assembly, the pump hub 18 having flange 22 is coated with a layer of the brazing paste 24 applied to the outer edge of the flange before placement of the hub into the central opening of the impeller for engagement therewith. After placement, a weight 26 is applied across the inner edge of pump hub 18 holding the hub in a compressed arrangement with the impeller during brazing.
  • the assembly positioned on jig 12 is then placed into a continuous belt brazing furnace of conventional design (not shown) where it is retained during the furnace heating cycle. This causes the vehicle in the brazing paste to evaporate; the filler metal then melts filling joint areas, which then solidifies upon furnace cooling to form a strong, leak-free multipart assembly in a single welding/brazing operation.
  • the assembly leaves the furnace and has sufficient time to cool the assembly is removed from the fixture.
  • the hub braze is inspected, and the fixture reused for another assembly.
  • the hub is then machined to achieve dimensional requirements, as well as surface finish and hardness. The process results in a strong economical joint between the hub and impeller.
  • the invention of simultaneously utilizing furnace brazing operations for eliminating processing steps of the pump sub-assembly also provides for joints possessing greater strength in the overlap areas. That is to say, when the joint is properly designed according to the present invention it will possess greater strength than the base material.
  • the following formula may be applied:
  • (T) is the tensile strength of the weakest member, namely the pump hub and the length of the lap (X), and (W) is the thickness of the base metal.
  • C is a joint integrity factor of 0.8 and L is the linear shear strength of brazed filler metal according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US12/316,229 2007-12-18 2008-12-10 Brazed torque converter pump hub assembly and method of fabrication Abandoned US20090155078A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/316,229 US20090155078A1 (en) 2007-12-18 2008-12-10 Brazed torque converter pump hub assembly and method of fabrication

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US804907P 2007-12-18 2007-12-18
US12/316,229 US20090155078A1 (en) 2007-12-18 2008-12-10 Brazed torque converter pump hub assembly and method of fabrication

Publications (1)

Publication Number Publication Date
US20090155078A1 true US20090155078A1 (en) 2009-06-18

Family

ID=40690205

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/316,229 Abandoned US20090155078A1 (en) 2007-12-18 2008-12-10 Brazed torque converter pump hub assembly and method of fabrication

Country Status (2)

Country Link
US (1) US20090155078A1 (de)
DE (1) DE102008059264A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102627187A (zh) * 2012-03-26 2012-08-08 南通市中矿水泥成套设备有限公司 一种新型的中央链提升机轮环与轮毂装置

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059365A (en) * 1975-07-23 1977-11-22 Borg-Warner Corporation Sheet metal hub assembly
US5857847A (en) * 1997-04-17 1999-01-12 Chrysler Corporation Brazing furnace parts feeding control
US5980208A (en) * 1997-12-19 1999-11-09 Ford Global Technologies, Inc. Torque converter hub sleeve convertible to various drive connections
US5988981A (en) * 1997-02-20 1999-11-23 Mannesmann Sachs Ag Pump impeller for a torque converter
US6276056B1 (en) * 1997-12-19 2001-08-21 Ford Global Technologies, Inc. Method for modifying a torque converter hub
US6494303B1 (en) * 1999-05-21 2002-12-17 Luk Lamellen Und Kuplungsbau Gmbh Torsional vibration damper for a torque transmitting apparatus
US20060064970A1 (en) * 2004-09-27 2006-03-30 Aisin Seiki Kabushiki Kaisha Torque converter
US7290987B1 (en) * 2003-10-14 2007-11-06 Sonnax Industries, Inc. Impeller hub for torque converter
US20080148724A1 (en) * 2006-12-21 2008-06-26 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Turbine and pump shells for torque converters and methods of manufacturing
US20080202879A1 (en) * 2007-02-28 2008-08-28 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Radially compliant pump hub
US20090113885A1 (en) * 2005-07-28 2009-05-07 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Integrated torque converters and assemblies

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059365A (en) * 1975-07-23 1977-11-22 Borg-Warner Corporation Sheet metal hub assembly
US5988981A (en) * 1997-02-20 1999-11-23 Mannesmann Sachs Ag Pump impeller for a torque converter
US5857847A (en) * 1997-04-17 1999-01-12 Chrysler Corporation Brazing furnace parts feeding control
US5980208A (en) * 1997-12-19 1999-11-09 Ford Global Technologies, Inc. Torque converter hub sleeve convertible to various drive connections
US6276056B1 (en) * 1997-12-19 2001-08-21 Ford Global Technologies, Inc. Method for modifying a torque converter hub
US6494303B1 (en) * 1999-05-21 2002-12-17 Luk Lamellen Und Kuplungsbau Gmbh Torsional vibration damper for a torque transmitting apparatus
US7290987B1 (en) * 2003-10-14 2007-11-06 Sonnax Industries, Inc. Impeller hub for torque converter
US20060064970A1 (en) * 2004-09-27 2006-03-30 Aisin Seiki Kabushiki Kaisha Torque converter
US20090113885A1 (en) * 2005-07-28 2009-05-07 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Integrated torque converters and assemblies
US20080148724A1 (en) * 2006-12-21 2008-06-26 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Turbine and pump shells for torque converters and methods of manufacturing
US20080202879A1 (en) * 2007-02-28 2008-08-28 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Radially compliant pump hub

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102627187A (zh) * 2012-03-26 2012-08-08 南通市中矿水泥成套设备有限公司 一种新型的中央链提升机轮环与轮毂装置

Also Published As

Publication number Publication date
DE102008059264A1 (de) 2009-06-25

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AS Assignment

Owner name: LUK LAMELLEN UND KUPPLUNGSBAU BETEILIGUNGS KG, GER

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HEEKE, GREGORY A.;MARATHE, BHASKAR;MUELLER, BRUNO;REEL/FRAME:022028/0505;SIGNING DATES FROM 20081121 TO 20081125

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION